Re: 2.6.18-rc6-mm1: GPF loop on early boot

Ingo Molnar wrote:

because userspace does not use it normally, while with %gs we'd switch between glibc's descriptor [which must be shadowed by the CPU] and the kernel's descriptor [which must be shadowed by the CPU too] - hence causing a constant reloading of the shadow register.

Well, that means the only operation which would be different would be the pop %fs at the end, since only it would end up loading a null selector. All the other operations would presumably take just as long.

   J
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Ingo Molnar <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Ingo Molnar <[email protected]>

• References:
  • 2.6.18-rc6-mm1
    • From: Andrew Morton <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Andi Kleen <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Ingo Molnar <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Andi Kleen <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Ingo Molnar <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Andrew Morton <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Ingo Molnar <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: 2.6.18-rc6-mm1: GPF loop on early boot
    • From: Ingo Molnar <[email protected]>

• Prev by Date: Re: 2.6.18-rc6-mm1: GPF loop on early boot
• Next by Date: Re: [patch] i386-PDA, lockdep: fix %gs restore
• Previous by thread: Re: 2.6.18-rc6-mm1: GPF loop on early boot
• Next by thread: Re: 2.6.18-rc6-mm1: GPF loop on early boot
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]